语法高亮，滚动条美化，设置页面调整

docs/javascript/Reference/Global_Objects/Map/set.html

@@ -4,7 +4,7 @@
 <div><iframe class="interactive interactive-js" frameborder="0" height="250" src="https://interactive-examples.mdn.mozilla.net/pages/js/map-prototype-set.html" width="100%"></iframe></div>
 <p class="hidden">The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone <a class="external" href="https://github.com/mdn/interactive-examples" rel="noopener">https://github.com/mdn/interactive-examples</a> and send us a pull request.</p>
 <h2 id="语法">语法</h2>
-<pre class="syntaxbox"><code><em>myMap</em>.set(key, value);</code></pre>
+<pre><code class="language-javascript"><code><em>myMap</em>.set(key, value);</code></code></pre>
 <h3 id="参数">参数</h3>
 <dl>
 <dt>key</dt>
@@ -16,7 +16,7 @@
 <p><code>Map</code> 对象</p>
 <h2 id="示例">示例</h2>
 <h3 id="使用_set_方法">使用 <code>set</code> 方法</h3>
-<pre class="brush: js">var myMap = new Map();
+<pre><code  class="language-javascript">var myMap = new Map();
 
 // 将一个新元素添加到 Map 对象
 myMap.set("bar", "foo");
@@ -24,14 +24,14 @@ myMap.set(1, "foobar");
 
 // 在Map对象中更新某个元素的值
 myMap.set("bar", "baz");
-</pre>
+</code></pre>
 <h3 id="Using_the_set_method_with_chaining">Using the <code>set</code> method with chaining</h3>
 <p>因为 Set() 方法返回 Map 对象本身，所以你可以像下面这样链式调用它:</p>
-<pre class="brush: js">// Add new elements to the map with chaining. 
+<pre><code  class="language-javascript">// Add new elements to the map with chaining. 
 myMap.set('bar', 'foo')
      .set(1, 'foobar')
      .set(2, 'baz');
-</pre>
+</code></pre>
 <h2 id="规范">规范</h2>
 <table class="standard-table">
 <tbody>